Cooktop



FIG. 1 is a front perspective view of the design of the cooktop;

FIG. 2 is a top elevational view thereof;

FIG. 3 is front elevational view thereof; and,

FIG. 4 is right side elevational view with the left side being a mirror image thereof.

The portion shown in broken lines is for illustrative purposes only and does not form any part of the invention. 

The ornamental design for a cooktop, as shown and described. 